except from the man himself. Even then I doubt he would disclose if it's based on an earlier movement. M. Dufour used to work at JLC, AP, and Genta and has had access to many highly complicated watches. It wouldn't surprise me if it's based on something similar from AP or a combination of movements with improvements of his own. In the past a good way to tell was matching the pinion positions, but do to that you'd need a good flat view of both movements you're comparing.